PHP Exercises: Valid an email address

Last update on May 26 2025 13:16:42 (UTC/GMT +8 hours)

38. Email Validation

Write a PHP program to valid an email address.

Sample Solution:

PHP Code:

<?php
// Function to validate an email address
function valid_email($email)
{
    // Trim any leading or trailing whitespaces from the email
    $result = trim($email);

    // Check if the trimmed email is a valid email address
    if (filter_var($result, FILTER_VALIDATE_EMAIL)) 
    {
        // If valid, return "true"
        return "true";
    } 
    else 
    {
        // If not valid, echo "false"
        echo "false";
    }
}

// Test the function with valid and invalid email addresses
echo valid_email("[email protected]") . "\n";
echo valid_email("abc#example.com") . "\n";
?>

Explanation:

Define Function valid_email:

The function valid_email($email) checks if the provided email address is valid.

Trim Whitespace:

trim($email) removes any leading or trailing whitespace from the email input and assigns it to $result.

Validate Email Format:

filter_var($result, FILTER_VALIDATE_EMAIL) checks if $result is a valid email address format.
If valid, the function returns "true".
If invalid, it prints "false".

Test Cases:

The function is tested with "[email protected]" (valid) and "abc#example.com" (invalid). The results are printed.

Output:

true                                                        
false

Flowchart:

For more Practice: Solve these Related Problems:

Write a PHP script to validate email addresses using custom regular expressions with support for new TLDs.
Write a PHP script to process a list of email addresses, segregating valid and invalid emails.
Write a PHP script to validate an email address and confirm that its domain has a valid MX record.
Write a PHP script to trim, sanitize, and validate an email address using filter_var and additional custom checks.

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PHP Code Editor:

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